Arc-lamp.



Witnesses:

3 SHEETS-SHEET 1.

4%,; Zi /24W A? L9 o Inventor Cromwell fiBHalvorson Jr*.,

His DTbtorney.

O. A. B. HALVORSON, JR.

ARC LAMP.

APPLIOATION FILED JULY 21, 1910.

Patented Aug. 11, 1914.

3 SHEETSSHEET 2.

Hls fittorneg.

C. A. B. HALVORSON, JR.

ARC LAMP.

APPLICATION FILED JULY 21, 1910.

Patented Aug. 11, 1914.

3 SHEETS-SHEET 3.

Inventor: Cromwell JTB. Halvorson J11, b My.

B Is DTttorneg.

Witnesses:

suspended.

UNITED STA'IMENT oFFroE.

CROMWELL A. B. HALVOBSON, JR, OF LYNN, MASSACHUSETTS, ASSIGNOB TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ABC-LAMP.

Specification of Letters Patent.

Patented Aug. 11, 1914.

To all whom it may concern:

Be itknown that I, CROMWELL A. B. HAL- vonson, J r., a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Arc-Lamps, of

which the following is a'specification.

This invention relates to electric arc lamps, and especially to those of the flaming or luminous arc type.

Q The object of the invention is to provide a lamp which is simplein construction, durable lnservice and not liable to get out of order.

The features of novelty will appear from the following description and the appended claims.

In-the accompanying drawings, Figure 1 is a perspective view of my improved lamp, with the outer casing removed; Fig. 2 is a sectional elevation of the working parts of the lamp on a larger scale; Fig. 3 is a sectional elevation taken at right angles to Fig. 2; Fig. 4 is a side elevation of a portion of the regulating mechanism with a diagram of the circuits of the lamp; and Fig. 5 is a sectional detail View;

The frame of the lamp comprises a central chimney 1 whose lower end is somewhat flaring and is provided with a circumferential horizontal flange 2 from which depends a circular wall 3, preferably sloping inward somewhat, as shown. A canopy 4 surrounds the chimney a suitable distance above the flange 2, and is attached to said chimney, as by means of the brackets 5. The canopy extends preferably beyond the eriphery of the flange to afford a support or the casing and globe holder, which are not shown in the drawings. To the upper end of the chimney is secured a spider 6, carrying the usual dead-eye 7 by means of which the lamp is The upper non-consuming electrode 8 is a massive stick of metal, preferably of copper, and is provided with laterallyprojecting webs 9 which are secured to insulated hangers 10 depending from the flange 2. In order to give an unobstructed entrance to.the

chimney above these webs, the flange is preferably arched above them on each side of the chimney, as shown at 11. The lower consummg electrode is supported by a rod 12 which passes through a lugl i extending inwardly from the flange 3. The rod 12 is in sulated from the lug 14 by a bushing 15, the upper port1on of which is provided with a flange 13 of greater diameter than the 0 ening in the lug 1 1 through which the bus ing passes. The rod 12 and the parts carriedthereby are supported by a nut 15 which engages a threaded portion of the rod 12 immediately above the bushing. A jam screw in the upper end of the rod bears against the plate 17 of insulating material placed against the underside of the flange 2. The lower end of the rod carries a frame 18,

- which has a guide 19 for the lower electrode 20, and comprises also two depending legs 21, having feet 22. The upper end of the electrode shell is beaded to hold in position the usual metal disk which prevents the magnetite mixture from falling out. Between the heels of these feet is fulcrumed a lever 23, preferably L-shaped, with its long horizontal arm pivoted to a plate 20, which is received in the lower end of the electrode 20. Tension springs 24 are attached to the toes of the feet 22 and to pins 25 at the angle of the L-shaped lever 23, so that said springs. tend to lift the long arm of the lever and urge the electrode 20 upwardly. The lower b1 urcated end of a member 26 receives the inner end of the lever 23 and is pivoted thereto. The upper end of the member 26, which is also bifurcated, is connected to the legs 21 by a link 26, the outer end of which is pivoted between the prongs at the upper end of the member 26, and the inner end of which is pivoted between the legs 21. Q A flat piece 26", provided with two upwardly di-, rected jaws, as shown in Fig. 5, is secured at the upper end of the member 26 between its prongs by a cotter pin28, and this member, rests upon the outer end of the link 26*, The pin 27 is received between the upper. prongs of the member 26 and between the two jaws of the member 26". Theupper ends of the lower electrode 20 and the; pin 27 and as they converge and are impelled upwardly by the springs 24 the pin 27 will be wedged against the upper end of the lower electrode 20. The pin 27 is consumed, together with the lower electrode, but much more slowly, and is renewed with the lower electrode when the lamp is trimmed. It will thus be understood-that the distance of the lower electrode from the upper one is kept constant, and the arcing face of the upwardly-feeding lower elect-rode remains stationary.

Inasmuch as the electrodes are stationary, so far as their tips are concerned, means must be provided for striking the are. Moreover, in flaming are lamps, a non-conducting crust is liable to form on the end of the composition electrode when it cools, and as this is of high electrical resistance, means must also be provided for breaking this crust off when the lamp is started, in order to permit the current to flow freely. I accomplish both the breaking of the crust and the striking of the are by means of a lever 29 fulcrumed at 30 within the wall 3, and preferably on an insulated pin 31 depending from the flange 2. The free end of the lever is a ring 32 encircling the electrodes and carrying a finger 33 which comes in contact with the lower electrode 20 when the lever is dropped to the position shown in Fig. 2; the position it occupies when the lamp is out. The lever drops suddenly to this position, and the blow of the finger on the end of the electrode 20 chips off any crust which may have formed there, so that said finger rests in good electrical contact with said electrode. The lever is electrically connected to the same side of the line as the upper electrode, so that when the current is turned on the circuit is at once established.

The striking of the are is effected by the electroinagnet 34 whose movable core 35 is attached to one end of a beam 36, pivoted at 37 on the sides of the chimney, which said beam straddles. The other end of said beam is connected by a pitman 38 with the lever 29 at a point between the fulcrum 30 and the ring 32. When the lamp circuit is closed, the electromagnet pulls down its core and this causes the lever 29 to be lifted, drawing the finger 33 away from the lower electrode and establishing the are, which at once shifts from said finger to the upper electrode. A dash-pot 39 is connected with one end of the beam and serves to retard the movements of the beam and the lever 29 in striking the are, so that there is no danger of its being snapped out by too quick a motion of the finger.

In the operation of certain types of flaming or luminous arc lamps, particularly the magnetite lamp, copious fumes are emitted from the are and a flocculent-like deposit is formed about the upper electrode. The movement of the arm 29 removes this deposit from the upper electrode. The beam 36 also serves to operate the automatic cutout of the lamp, which consists of the two contacts 40, 41 located in a short circuit 42 across the lamp, containing suitable resisters 43. The contact 40 is stationary, while the other one is attached to the beam so that when the current is turned on this short circuit will be opened.

By referring to Fig. 4, it will be seen that one side of the line is connected to the contact 41 and also to the upper electrode 8 and the lever 29, while the other side of the line is connected to the other contact 40 through the resisters 43, and also to the electromagnet 34 and thence to the lower electrode; preferably by means of an insulated screw 44 passing through the wall 3 and tapped into the rod 12.

I do not claim the lower electrode and the mechanism associated therewith for impelling the same upwardly, as this is a joint invention of John T. Beechlyn and myself, for which a separate application, Serial No. 688,180 has been filed.

It will be seen that this lamp is quitesimple in construction, and that the electromagnet, dash-pot and cut-out are protectedfrom the heat and fumes of the are by the flange 2 and the wall 3; the fumes passing freely up the chimney which is directly above the are whose stationary position is an advantage. The moving parts are few, and all are readily accessible for inspection or repair, and the lamp is compact and attractive in appearance.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. In a flaming or luminous are lamp, the combination with electrodes the arcing faces of which are out of contact and substantially stationary, one above the other, an electromagnet, a lever movable thereby and carrying at one end a ring loosely embracing one of the electrodes and adapted in operation to remove arc deposits therefrom, said ring being provided with a conducting finger which in one position of the lever engages one of the electrodes and in the other position is adjacent to the other electrode.

2. In an arc lamp, an upper non-consuming electrode, a lower consuming electrode upon which a non-conducting layer is liable to form during the operation of the lamp, a

lever free to move in one direction by grav-.

ity and provided at its free end with a pin adapted to forcibly engage and break the non-conducting layer at the arcing end of the consuming electrode when the lever moves under the action of gravity. an electromagnet fon moving the lever against In witness whereof,"I have herennto set I gfiavity and thereby startingafi are between my hand this 18th day of July, '1910.

t e pin and the lower electro e said Iever being proportioned and arranged to bring mW mvomx 5 the conducting pin in arc-transferring prox- Witnesses: imity to the upper electrode when the lever JOHN A. MCMANUS, Jr.,- is moved by the magnet. CHARLES A. BARNARD. 

